feat(i18n): 管理端与玩家端三语支持（中/英/马来语）

- 管理后台 adminT 文案库、结算与代理端页面、表单校验
- 玩家端 vue-i18n 补全首页/公告/串关与 ms 文案
- Element Plus ms 语言包与共享 locale 工具

apps/player/src/composables/useAnnouncements.ts

@@ -1,4 +1,5 @@
 import { ref } from 'vue';
+import { useI18n } from 'vue-i18n';
 import api from '../api';
 import { resolveAnnouncements } from '../constants/defaultAnnouncement';
 
@@ -20,14 +21,16 @@ function collectAnnouncementLines(data: {
 }
 
 export function useAnnouncements() {
-  const items = ref<string[]>(resolveAnnouncements([]));
+  const { t } = useI18n();
+  const items = ref<string[]>(resolveAnnouncements([], t('home.announcement_default')));
 
   async function load() {
+    const fallback = t('home.announcement_default');
     try {
       const { data } = await api.get('/player/home');
-      items.value = resolveAnnouncements(collectAnnouncementLines(data.data));
+      items.value = resolveAnnouncements(collectAnnouncementLines(data.data), fallback);
     } catch {
-      items.value = resolveAnnouncements([]);
+      items.value = resolveAnnouncements([], fallback);
     }
   }